Sleeve bearings vs. Bushings - what are sleeve bearings and bushings?
Sleeve bearings are often very inexpensive, compact, lightweight, and have a high load-carrying capacity.
Sleeve bearings are also known as bushings, bushing bearings, plain bearings, self-lubricating bearings, or journal bearings.
The sleeve bearings feature is to ensure linear or rotational movement between the two parts. They are used to constrain, guide, or reduce friction in rotary or linear applications. They function via a sliding action instead of the rolling action used by ball, roller, and needle bearings.
Sleeve bearings consist of one part that is built up of many types of materials, layered, and combined into a load-carrying system to provide smooth operation and greater durability.
Sleeve bearings are mainly divided into many types, for example:
- DU PTFE composite bushing (Oilless bearing)
- DX POM composite bushing
- Bimetal bushing
- Bronze Wrapped Bearing
- Solid lubricant inlaid bearings
- Bronze Liners and Wear Plates
The shapes of Sleeve bearings are mainly divided into three types.
- Sleeve- A sleeve bearing is cylindrical with straight inside and outside diameters.
2. Flanged- A flanged plain bearing has a flange at one end that is used as a locating surface during assembly. Some flanges may be large enough to incorporate mounting holes used to secure the bearing in place.
3. Thrust Washer- Dry sliding thrust washers are designed for applications where axial space is limited, maintenance is not possible, and where lubricant starvation can occur.
Bushings are suitable for rotating, oscillating, and linear movements. There are different functions according to different appearances.
The most common is the flanged bearing, which can take axial and side loads. For higher side loads, a combination of a thrust washer and a cylindrical bearing is a good alternative. If the load is purely radial, go for a simple cylindrical bearing.
As mentioned, Sleeve bearings can be made from many types of materials.
So, what are Sleeve bearing’s basic materials and lubricating materials?
- Base materials
- Carbon steel
- Harden steel
- Stainless steel
- bronze-steel alloy
- Lubricant materials
- PTFE (Teflon)
- Plastic oil
Sleeve bearings vs. Bushings - What are sleeve bearings’ key features?
DU PTFE composite bushing (Oilless bearing)
Oilless Slide Bushing is made of the PTFE composite material, which is a copper-plated steel plate on which a porous layer of tin bronze powder is sintered and a mixture of PTFE and lead is filled into and covered by a porous layer by a rolling process.
- PTFE with lipophilicity fiber forms a transfer film when operating, which can protect the shaft.
- the low friction coefficient and good anti-wear properties make the working life longer.
- Fits well in motion of rotation, sway, and reciprocating.
- Dry or with less grease, maintenance-free.
DX POM composite bushing
It is a boundary lubricating bushes made of the POM composite material, which also has a copper-plated steel plate on which a tin bronze powder is sintered, and modified polyformaldehyde resin (POM) is firmly anchored in the sintered bronze layer. The surface of the covering layer has many pockets to retain lubricating grease.
- Good load and anti-wear capacity
- It is suitable for rotation, swing, or frequent start and stops movements under high load and low-speed conditions.
- In the case of boundary lubrication, it can work without oil for a long time, and refueling or grease during work can prolong the working time
Based on high-quality low carbon steel sintering bronze alloy or lead-free bronze alloy on the surface, provide a high specific load, especially fits for high speed and shock conditions.
Oil pockets or grooves can be machined in the liner for better grease storage. Widely used in truck chassis, agricultural machinery, construction machinery, etc. In addition, lead-free meet EU requirements and are the best choice for the automotive field.
- High fatigue strength, load capacity, and impact strength.
- Good corrosion resistance
- Relatively good surface performance
Bronze Wrapped Bearing
The bearing is wrapped in a cold form of able homogenous bronze, which will obtain exceptional material properties. Standard bearings are equipped with diamond-shaped lubrication grooves on the bearing surface. These indentations act as lubricant reservoirs and rapidly form a lubricating film during the start-up motion, reducing start-up friction. Typical applications are widely used in construction machineries such as hoisting machinery, automobiles, tractors, trucks, machine tools, and some mining engines.
- High density & load capacity.
- Good property of anti-wear, long working time.
- In place of traditional casting bronze bush.
- Cheaper and more compact.
Solid lubricant inlaid bearings
This type of bearings material provides a maintenance-free and low-friction bearing especially suitable for high loads and intermittent oscillating motion. Solid lubricants in bronze combine the strength of bronze with the wear resistance of graphite. Applications are used in automotive production lines, water industry, dam gates, plastic molding machinery, etc.
- Well-designed and widely used.
- Superior chemical resistance and corrosion resistance.
- The superior functions can be brought into play on the occasion when oil film cannot be formed for frequent start-ups, like high load, low rotating speed, cycle movement, reciprocating motion, swing motion, and so on.
- Oil-free use.
- Low cost of use and high competitiveness.
Bronze Liners, Steel Liners & Wear Plates
Bronze liners, steel liners or wear plates are abrasion-resistant liners used to decrease wear and tear on surfaces subjected to heavy rolling friction and impact in the machines.
In addition, the bronze liners and steel liners have the ultimate objective to help keep the roll center lines precisely where they should be.
Two very popular bronze alloys used for wear plate bearing pads are C93200 SAE 660 Bearing Bronze and C95400 Aluminum Bronze.
Bronze liners are used on multiple wear surfaces throughout a rolling mill. The goal of the bronze liners is to assist in keeping the roll center lines at precisely the desired locations. Bronze liners and wear plates play a very important role in multiple locations on today’s metal rolling equipment. Using poorly designed liners or liners that are not compatible with the surfaces they contact can greatly reduce product quality and increase maintenance expense.
- Well-designed and widely used.
- The use of the proper liners can minimize maintenance costs.
- Metal liners or wear plates are replaceable devices that are simple to install and far less expensive than replacing the part or equipment intended to protect.
- High corrosion resistance.
Thanks for reading “Sleeve bearings vs. Bushings.”
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